A source with direct knowledge of the negotiations has informed BoxingScene.com that former champion and cagey veteran Steve Forbes (35-10, 11KOs) accepted a deal to face welterweight contender Jessie Vargas (18-0, 9KOs) on the undercard to the Floyd Mayweather-Miguel Cotto HBO pay-per-view, which takes place on May 5th at the MGM Grand in Las Vegas.